The owner of Conneaut Lake Park in Conneaut Lake, PA wants to know if the average age of its visitors has changed in the past decade. Earlier market research (one decade prior) showed that the population is approximately normally distributed with mean 45 years old and a standard deviation of 14 years. Now for the present study a random sample of 25 visitors is taken. This shows a mean age of 40 years. Perform a hypothesis test at a .05 significance level to see whether there is enough evidence to say that the mean age of visitors to Conneaut Lake Park has changed?